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JSI Tip 4308. When you use RRAS to add a routing interface on your Windows 2000 Server, you receive event 20106, 'parameter is incorrect'?

Event 20106 error:
Source: Remote Access
Category: None
Description: Unable to add the interface Internal with the Router Manager for the IP protocol.
The following error occurred:
the parameter is incorrect.

To workaround this issue:

1. Administrative Tools / Routing and Remote Access.

2. Right-click the RRAS sever and press Properties.

3. Select the General tab.

4. If the server is configured for local routing only (LAN router), you can ignore this event. In local routing only mode,
the IP Router Manager doesn't accept the internal interface, which is used to control the behavior of WAN interfaces
that dial the network.